Mechanism for the remote transmission of movement



M. c. PIETERSE 2,926,624 MECHANISM FDR THE REMOTE TRANSMISSION OF MOVEMENT March 1, 1960 2 Sheets-Sheet 1 Filed May 1, 1957 INVENT OR #4 R u s 6'. Esra-IP55,

ATTORNEY March 1, 1960 M. c. PIETERSE 2,926,624

MECHANISM FOR THE REMOTE TRANSMISSION OF MOVEMENT Filed May 1, 1957 2 Sheets-Sheet 2 INVENTOR MAR/us C. P/s TERSE,

BY W4 ATTORNEY MECHANISM non THE REMOTE TRANS- MISSION or MOVEMENT Marius Cornelis Pieterse, Voorschoten, Netherlands Application May 1, 1957, Serial No. 656,307

Claims. (Cl. 116-21) United States Patent-O 2,9Z,G24 Patented Mar. 1, 1960 with the same axis of rotation as the rotatable operating member of the transmitter, said yoke with pointer being adapted to move independently of said operating member and being pivotally connected at either end to a rod which at the other end is only able to take up pushingforces from the pushing members of any duct.

It is advisable, when this preferred feature is employed, to have the yoke connected with the pointer engage with some friction about the stationary shaft of rotation thereof and of the rotatable operating member of the trans mitter.

The invention will, now be explained more fully with reference to the drawing, in which Fig. 1 is a side elevation and partial vertical crosssection through a transmitter with adjacent par-ts of the transmission lines, forming part of a mechanism according to a preferred embodiment of the invention.

by pushing and displacement under pressure of the pushing, members in one of the ducts the pushing members in the other duct are displaced in the opposite direction, i.e. from receiver to transmitter.

A mechanism of this kind is known from the British patent specification No. 522,863 and from the US. patent specification No. 2,384,742. I

The invention has for its object to furnish for such a mechanism .an indicator device which indicates the trans- Fig. la is a more or less diagrammatic view of a receiving station the ducts 9 of which connect with the ducts 9 of Fig. l, as indicated at the line x----x.

Fig. 2 is a front elevation and partial vertical crosssection through the same parts as in Fig. 1, in a plane at right angles to that of Fig. l.

The transmitter is accommodated in a column 1 with a detachable cover 2. Located at the boundary plane between column and cover is a horizontal shaft 3, which is stationary. At either end of the column a hand lever 4 is supported in bearings about this shaft. Each of these hand levers is rigidly connected with a yoke 5; about the ends of which push rods 6 are adapted to pivot;

I These push rods act via sliding blocks 7 (operating in mitted movement as accurately as possible in a place near the transmitter. To this end a mechanism as referred tolin the preamble is characterized by the fact that connection which capable of taking up aforce in only one direction, in sucha way that indicator device reacts only to the movement of the pushing members in the duct other than that in which an impulse is transmitted from transmitter to receiver. By this means the result is achieved that the indicator device indicates the movement which has actually taken place in the receiver and which may deviate slightly from the adjustment that has been given to thecontrol member of the transmitter. In fact, the force to be transmitted could cause flexible deformations in the duct transmitting the impulse, while the pushing members in the other duct are displaced in the opposite direction without being subjected to any appreciable pressure. The derivation of the indication ly widened inside,

of the movement from the pushing members in the transmission duct not subjected to considerable forces thus gives a practically faultless indication of the displacernent brought about in the receiver. Even a certain amount of play in the system will lead to minimum errors in the indication in the device according to the invention.

It is to be noted that from the British patent specification No.230,591 a mechanical remote-eontrol device is known in which in the neighbhourhood of the transmitteris located an indicator device which, independently of .the'system by means of which the motion is transmitted guide elements as shown) on pushing members 8, move bly arranged in fixed guide tubes or ducts 9. These ducts, four in number, lead to two receivers in all, are mounted stationarily, and are filled with pushing members in the form of mutually abutting elements displaceable longitudinally. in each duct, such as the mem bers 8, which may consist of rod-shaped bodies in the straight parts of the duct and of balls or rollers in the bends of the ducts.

Each lever 4 operates a separate yoke 5 and, via push rods connected to each of these yokes, two of the four separate ducts 9.

The blocks 7 have projecting parts 10, each having a part 11 with the shape of a deep cup which is closed at the bottom and towards the top is preferably conical- Into each of the cup-like parts a push rod 12 for the indicator deviceengages. Each of these push rods 12 is pivotally connected toone end of a yoke 13, in such a way that each of the two push rods 12 of the two corresponding ducts 9 leading to the same receiver individually engages one. of the two ends of the same yoke 13. This yoke 13 is preferably adapted to rotate with some friction aboutthe fixed shaft 3. ,Rigidly. connected to this yoke via an arm 14 is a pointer 15 which passes along an indicating scale 16.

Each hand lever 4 serves to give an adjustment to a separate receiver, and the transmitter. is therefore of double construction. i I

Thereceiver may be of any known or desired construction, for example, it may be of the type shown in my copending US. application Ser. No. 455,648 filed Sept. 13, 1954 now US. Patent 2,869,377, or it may be a substantial duplicate of the transmitting mechanism herein shown with its yoke shaft connected to the el'e ment to be moved, just as the receiver in my said copending application may be a substantial duplicate of the transmitter shown therein.

Merely for purposes of illustration, and without limiting the invention thereto, a typical operated means is shown in Fig. 1a, comprising elements 8', 7', ,6, 5' which may be substantial duplicates of element 1.], 3 5

of Fig. 1, and "which are coupled to the series of pushin}; elements in the ducts h, as above described, so that when the operated means is pushed by the elements in a first of the ducts 9, it imparts pushing motion to the series of elements in the second duct 9. I

when an adjustment is made by rotating one of the hand levers 4 about the shaft 3 so that the rod '6 'at one end of the corresponding yoke 5 is forced down, the corresponding block 7 and the corresponding pushing member 8 will also move down, as a result of which the pushing members are displaced in a first corresponding duct 9 from transmitter to receiver and the adjustment is received in the receiver. In the receiver the pushing member 8' will 'move upwardly; the corresponding block 7" and the corresponding rod 6' connecting an end of the corresponding yoke 5' are also forced upwardly. Since the system is a closed one, the pushing members in the corresponding second or other duct 9 from receiver to transmitter will also be displaced under the influence of the displacement of the operated means or yoke 5' together with the downward movement of the rod 6' at the other end of the corresponding yoke 5, the corresponding block *7 and the corresponding pushing member 8' in the receiver, in the opposite direction, so that the pushing members in question cause the respective block 7 in said other duct to move upwards.

V The push rod 6, which transmits "the movement from the transmitter, fits with its spherical head 6a into a recess of the 'block7, in such away that this head will be disengaged from said block if 'the pushing members at the transmitter end of the return line do not follow the transmitted adjnstme'nt completely. To achieve this, the recessfor thesphe'rical head 6a of each rod 6 in the block 7 "is s shaped that when some clearance arises between said head 6a and the bottom of the recess in the block 7, said'he'ad 6Z1 'will's'till be contained in and guided by the block 7. Because each rod 12 of the indicator device can only takeup push and no tension from the block 7 via'thebottom of the'recess in the corresponding'cupshaped part 11, on the side Where a movement is transmitted from the transmitter to the receiver the block'7 wlill not'take the respective'rod 12 downwards along with it. Owing'to the friction between the respective yoke 13 and the shaft 3 said yoke 13,will try to'remain stationary during the movement of lever 4. Only movement in'the return duct, 'i.e. that from receiver to transmitter, will cause the block 7 of the return duct to move upwards, and as a result of this the corresponding rod '12 of the indicator device will also be forced upwards by this'block A 7 in consequence of which the yoke 13 is rotated and the pointer 15 is moved along the scale 16. Thus, in view of the flexibility and play in the system 'and in connection with the fact that in the return duct the cornpressive force is small, and consequently the compression and the deformation are also smaller, the-indicator device will accurately indicate the adjustment as it "has taken placein the receiver. Any breakage of a duct, loosening of a tube'coupling or any other defect 'can thus at once be observed at the transmitterbeoause it"will be visible that thepointer 15 does notjfoll'owthe-displacernent of the hand lever 4, or not sufliciently so.

What'I claim is:

-1. The combination, with a mechanism for the'transmission of vmovement, said mechanism comprising n transmitting station and a receiving station, a .pair of ducts extending between said stations, a series of mutual.- lya'butting elements displaceable longitudinally in each duct, operating-means at the transmitting station for selectively imparting pushing motion to either-ofsaid series and-:op'e'rated means-at the receiving station coupled to each of said series and impartingl'pushingtmotion to the ether of-said series 'as it ris-Imoved-by beingzpushed-by uthr of said 'series; of motionindicatingimeans at said transmitting station responsiveto the motion imparted r 4 motion is imparted to either of said series by said op erating means; the operating means at the transmitting station comprising a first yoke means rotatable about an axis and comprising means for engaging and selectively pushing either of said series of elements and for withdrawing ahead of the other of said series of elements depending on the direction of rotation of said first yoke means; and the motion indicating means at said transmitting station comprising a second yoke means rotatable about the same axis as said first yoke means, a pointer carried by said second yoke means, .said second yoke means and pointer being rotatable about said axis independently of said first yoke means, and push rods pivotally connected to said second yoke means at opposite sides of said axis, said push rods being abuttingly engaged by said seriesof pushing elements, respectively. 2. A combination according to claim 1, said motion indicating means comprising frictionally engaging means for displaceably retaining said second yoke means in the positions of rotation about said axis to which it is moved by motion of said other series of elements, respectively.

3. The combination, with a mechanism for the transmission of movement, said mechanism comprising a transmitting station "and a receiving station, a pair of ducts extending between said stations, 2. series of mutually abutting elements displaceable longitudinally in each duct, operating means at the transmittingstation for se lectively imparting pushing motion to either of said series and operated means at the receiving station coupled 'to each of said series and imparting pushing motion to the other of said series as it is moved by being pushed by either of said series; of motion indicating means at'sa'id transmitting station responsive to themotion imparted to the other of said series by said operated meanswhen motion is imparted to either of said series by said operating means; said motion indicating means comprising a pointer, means including'a pair of push rods fortespectively moving said pointer in opposite directions,

cup-like coupling members abuttingly engaged by elements of saidseries near the transmitting station end of said series of abutting elements, respectively, the-ends or said push rods,being socketed in and retained against lateral misalignment by said cup-like coupling members.

4. A mechanism for the transmission of movement comprising, in combination, a transmitting station anda receiving station, a pair of'ducts extending between said stations, and aseries' of mutually abutting pushing elements displaceable longitudinally in each duct; operated means at said receiving station abuttingly coupled to the series of elements-in each of said ducts and imparting pushing motion to the-series of elements in the second of said ducts as it is moved by being pushe'd'by theseries of elements in a first of said ducts; operating means at said transmitting station abuttingly coupled to theseries of elements in each of said ducts andse lectively operable to impart 'pushing motion to the series of elements :in

either of said ducts; and motion in'dicating'means at said transmitting station abuttingly coupled to the series or elements ineach of said ductsindependently of said operating means and responsive to motion imparted to the series of elements in the second of said ducts by said operated means when-motion isimpartedto the series of elements in a first of said duotsbysaid operatingimeans.

5. The combination, with amechanism .for thetransmission of movement; which mechanism comprises a transmitting station and a receiving station, a pair of ducts extending between said stations,aseries of mutually abutting pushing elements 'displaceable longitudinally in each duct, operating means at the transmitting station abuttingly coupled to'the series of-elementsin-each-of said ducts and selectively operable to impart pushing motion to the series of elements in either of saidducts, and operated ,means at the receiving station abuttingly coupled to-sthe aseries'of'elements in each ct -said vtdunts and: imparting pushing motion to the 1 series ,oftelements in the second of said ducts as it is moved by being pushed by the series of elements in a first of said ducts; of motionindicating means at said transmitting station abuttingly coupled to the series of pushing elements in each of said ducts independently of said operating means and responsive to the motion imparted to the series of pushing elements in the second of said ducts by said operated means, when motion is imparted to the series of pushing elements in a first of said ducts by said operating means.

References Cited in the tile of this patent UNITED STATES PATENTS FOREIGN PATENTS Germany of 1897 Great Britain Aug. 1, 1940 France Jan. 3l, 1944 Canada Jan. 20, 1953 

